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  • 1
    Electronic Resource
    Electronic Resource
    Silica concentration dependence of the kinetics of polydimethylsiloxane adsorption on aggregates (1998)
    Springer
    Polymer bulletin 41 (1998), S. 253-260 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The kinetics of adsorption of pure polydimethylsiloxane or of bimodal mixtures, onto silica aggregates, was observed from the melt as a function both of polymer weight fraction (2.5 to 20 g/g) and of the specific area (50, 150 and 300 m2/g). Attention was focused on filled polymers wherein silica aggregates are connected to one another by adsorbed chains to form a network. Results were analysed according to a molecular approach. All observed kinetics curves were found to obey a property of superposition by using a suitable reduced time variable defined as : ; is the number average molecular weight and Qi is the initial amount of polymer per unit mass of silica. The rate of adsorption is proportional to 1/Qi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050359
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  • 2
    Electronic Resource
    Electronic Resource
    Skinned polymeric membranes. Approach to the mechanism of formation of surface holes (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 38 (1995), S. 299-303 
    Details
    ISSN: 0959-8103
    Keywords: skin membranes ; hole formation ; diffusion ; polyetherimides ; videomicroscopy ; solvent diffusion coefficient ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is shown quantitatively that the formation of holes through the skin of membranes, prepared by the quick immersion in water of polyetherimides in solution in N-methylpyrrolidone, is governed by the solvent mobility. The surface pattern observed by videomicroscopy exhibits a characteristic distance between neighbouring holes (≃5 μm) which is a linear function of D-1s; Ds is the solvent diffusion coefficient in the polymeric solution, measured using a pulsedfield gradient NMR technique. The dependence of this distance on the solvent concentration in water is also characterized.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1995.210380312
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  • 3
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    Television viewing and aggressive behavior during adolescence and adulthood (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-30
    Description: Television viewing and aggressive behavior were assessed over a 17-year interval in a community sample of 707 individuals. There was a significant association between the amount of time spent watching television during adolescence and early adulthood and the likelihood of subsequent aggressive acts against others. This association remained significant after previous aggressive behavior, childhood neglect, family income, neighborhood violence, parental education, and psychiatric disorders were controlled statistically.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnson, Jeffrey G -- Cohen, Patricia -- Smailes, Elizabeth M -- Kasen, Stephanie -- Brook, Judith S -- DA-03188/DA/NIDA NIH HHS/ -- MH-36971/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2002 Mar 29;295(5564):2468-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Columbia University and the New York State Psychiatric Institute, 1051 Riverside Drive, New York, NY 10032, USA. jjohnso@pi.cpmc.columbia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11923542" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; *Aggression ; Child Abuse ; Educational Status ; Female ; Humans ; Income ; Interviews as Topic ; Longitudinal Studies ; Male ; Mental Disorders ; Sex Characteristics ; Socioeconomic Factors ; Surveys and Questionnaires ; *Television ; Theft ; Time Factors ; *Violence
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Nuclear safety. Nuclear power plants and their fuel as terrorist targets (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-09-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapin, Douglas M -- Cohen, Karl P -- Davis, W Kenneth -- Kintner, Edwin E -- Koch, Leonard J -- Landis, John W -- Levenson, Milton -- Mandil, I Harry -- Pate, Zack T -- Rockwell, Theodore -- Schriesheim, Alan -- Simpson, John W -- Squire, Alexander -- Starr, Chauncey -- Stone, Henry E -- Taylor, John J -- Todreas, Neil E -- Wolfe, Bertram -- Zebroski, Edwin L -- New York, N.Y. -- Science. 2002 Sep 20;297(5589):1997-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MPR Associates, Inc., Alexandria, VA 22314-3230, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12242425" target="_blank"〉PubMed〈/a〉
    Keywords: *Nuclear Energy ; *Nuclear Reactors ; *Power Plants ; Radioactive Hazard Release ; *Safety ; *Terrorism ; Ukraine ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Protein kinase C isotypes controlled by phosphoinositide 3-kinase through the protein kinase PDK1 (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-25
    Description: Phosphorylation sites in members of the protein kinase A (PKA), PKG, and PKC kinase subfamily are conserved. Thus, the PKB kinase PDK1 may be responsible for the phosphorylation of PKC isotypes. PDK1 phosphorylated the activation loop sites of PKCzeta and PKCdelta in vitro and in a phosphoinositide 3-kinase (PI 3-kinase)-dependent manner in vivo in human embryonic kidney (293) cells. All members of the PKC family tested formed complexes with PDK1. PDK1-dependent phosphorylation of PKCdelta in vitro was stimulated by combined PKC and PDK1 activators. The activation loop phosphorylation of PKCdelta in response to serum stimulation of cells was PI 3-kinase-dependent and was enhanced by PDK1 coexpression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Le Good, J A -- Ziegler, W H -- Parekh, D B -- Alessi, D R -- Cohen, P -- Parker, P J -- New York, N.Y. -- Science. 1998 Sep 25;281(5385):2042-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Protein Phosphorylation Laboratory, Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9748166" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Phosphoinositide-Dependent Protein Kinases ; Binding Sites ; Cell Line ; Chromones/pharmacology ; Enzyme Activation ; Enzyme Inhibitors/pharmacology ; Humans ; Isoenzymes/*metabolism ; Morpholines/pharmacology ; Phosphatidylcholines/pharmacology ; Phosphatidylinositol 3-Kinases/*metabolism ; Phosphatidylinositol Phosphates ; Phosphatidylserines/pharmacology ; Phosphorylation ; Protein Kinase C/*metabolism ; Protein Kinase C beta ; Protein-Serine-Threonine Kinases/*metabolism ; Recombinant Proteins/metabolism ; Tetradecanoylphorbol Acetate/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Role for stearoyl-CoA desaturase-1 in leptin-mediated weight loss (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-07-13
    Description: Leptin elicits a metabolic response that cannot be explained by its anorectic effects alone. To examine the mechanism underlying leptin's metabolic actions, we used transcription profiling to identify leptin-regulated genes in ob/ob liver. Leptin was found to specifically repress RNA levels and enzymatic activity of hepatic stearoyl-CoA desaturase-1 (SCD-1), which catalyzes the biosynthesis of monounsaturated fatty acids. Mice lacking SCD-1 were lean and hypermetabolic. ob/ob mice with mutations in SCD-1 were significantly less obese than ob/ob controls and had markedly increased energy expenditure. ob/ob mice with mutations in SCD-1 had histologically normal livers with significantly reduced triglyceride storage and VLDL (very low density lipoprotein) production. These findings suggest that down-regulation of SCD-1 is an important component of leptin's metabolic actions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, Paul -- Miyazaki, Makoto -- Socci, Nicholas D -- Hagge-Greenberg, Aaron -- Liedtke, Wolfgang -- Soukas, Alexander A -- Sharma, Ratnendra -- Hudgins, Lisa C -- Ntambi, James M -- Friedman, Jeffrey M -- GM07739/GM/NIGMS NIH HHS/ -- R01-DK41096/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2002 Jul 12;297(5579):240-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Genetics, Center for Studies in Physics and Biology, Rogosin Institute, Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12114623" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Body Weight ; Crosses, Genetic ; Down-Regulation ; Eating ; Energy Metabolism ; Female ; Gene Expression ; Gene Expression Profiling ; Leptin/genetics/*physiology ; Lipid Metabolism ; Lipids/analysis ; Lipoproteins, VLDL/metabolism ; Liver/*enzymology/metabolism/ultrastructure ; Male ; Mice ; Mice, Obese ; Microsomes, Liver/enzymology ; Mutation ; Oligonucleotide Array Sequence Analysis ; Oxygen Consumption ; RNA, Messenger/genetics/metabolism ; Stearoyl-CoA Desaturase/genetics/*metabolism ; Vacuoles/chemistry/ultrastructure ; *Weight Loss
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Silica concentration dependence of the kinetics of polydimethylsiloxane adsorption on aggregates (1998)
    Springer
    Details
    Publication Date: 1998-08-17
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 8
    Electronic Resource
    Electronic Resource
    A rate equation model for the growth of GaN on GaN(0001¯) by molecular beam epitaxy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1219-1226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaN(0001¯) films were grown by molecular beam epitaxy using ammonia and elemental Ga. The surface reactivity and growth kinetics of GaN(0001¯) were investigated as a function of growth parameters using desorption mass spectroscopy. Growth proceeds either by island nucleation or by step flow, depending on the steady state surface coverage of Ga. Three Ga adsorption states were found on the surface, one chemisorption and two weak states. One of the weak states corresponds to Ga adsorbed on a gallided surface, while the other corresponded to an intrinsic physisorption state on a hydrogen-passivated, nitrided surface. An abrupt growth mode transition between excess Ga and excess nitrogen was found as a function of growth parameters. The transition was modeled by rate equations based on growth at step edges and the three types of adsorption states. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372000
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of iron based precipitates in GaAs layers grown by molecular-beam epitaxy (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2400-2402 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaAs layers that contain small Fe-based precipitates have been grown using molecular-beam epitaxy. The layers were produced either by codepositing Fe during GaAs growth or by first depositing a thin layer of an Fe-Ga alloy and then growing a capping layer of GaAs. Microstructural characterization of the layers was performed by using transmission electron microscopy. For those samples in which the Fe alloy layer was deposited, the layer disappeared after GaAs growth, leaving behind Fe-containing precipitates distributed throughout the GaAs overlayer. Precipitates were also formed in Fe codeposited samples. The sizes and number densities of the precipitates were dependent on the growth method used, with mean diameters ranging from 21 to 47 nm and number densities from 1013–1015 per cm3. The phase, orientation, and morphology of the particles were also dependent on the growth conditions used, with FeAs and Fe being observed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113953
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  • 10
    Electronic Resource
    Electronic Resource
    Hexagonal growth spirals on GaN grown by molecular-beam epitaxy: Kinetics versus thermodynamics (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2315-2317 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaN grown by molecular-beam epitaxy on Ga-polar GaN templates prepared by metal organic chemical vapor deposition shows a variety of morphologies that depend on defects and growth conditions. We measured the mean terrace widths of hexagonal growth spirals or hillocks versus ammonia and Ga fluxes and substrate temperature. The measurements were compared to a near equilibrium model of the growth. The results indicate that under excess Ga growth conditions, Ga-polar GaN(0001) has a mean step-edge energy of 0.27 eV/Å. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361278
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